The Queen is cutting her workload – stepping down as patron of more than 20 national organisations at the end of the year, Buckingham Palace has said.

Her Majesty, who turned 90 in April, will relinquish her association with the groups – just as the Duke of Edinburgh broke formal ties with some of his patronages when he turned 90 in 2011.

The move is likely to be seen as a common sense decision that acknowledges the Queen’s advancing years, but Buckingham Palace stressed she was still patron of more than 600 organisations.

The patronages of organisations including Battersea Dogs and Cats Home, Barnardo’s and the All England Lawn Tennis and Croquet Club will be taken on by other members of the royal family.

Buckingham Palace said in a statement: “At the end of the Queen’s 90th birthday year, Her Majesty will step down as patron from a number of national organisations. The patronages will be passed on to other members of the royal family in the coming months.

“Her Majesty is currently patron of more than 600 organisations and has enjoyed a close and active association with a great number of them throughout her reign. Her Majesty will continue to serve as patron to hundreds of charities and institutions but will now share this work with her family. Many of the organisations listed below already have other members of the royal family as vice-patrons or presidents, which will ensure a smooth transition.

“This decision follows the example set by the Duke of Edinburgh who resigned from a number of patronages on the occasion of his 90th birthday in 2011.”